AP3776
Document overview
- Manufacturer or author: Diodes Incorporated
- PDF pages: 17
Technical content
Features
Primary Side Control for Eliminating Opto-coupler 10mW No-load Input Power Compensation for External Component Temperature Variations Flyback Topology in DCM Operation Random Frequency Adjustment to Reduce System EMI Semi-valley Turn on for the Higher Efficiency Built-in Soft Start Over Voltage Protection Over Temperature Protection Short Circuit Protection AP4341, APR343 or APR3415 Awaking Signal Detection Audio Noise Reduction Internal Cable Compensation SO-8 Package Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Pin Assignments (Top View) IS EM VCC OUT FB CPC VCS GND SO-8
Applications
Adapter/Chargers for Shaver, Cell/Cordless Phones, PDAs, MP3 and Other Portable Apparatus Standby and Auxiliary Power Supplies Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Hal ogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, < 900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.
Document number: DS36707 Rev. 4 - 2 2 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT Typical Applications Circuit TR1 VO C21 C22OUT GND VCC IC2 AP4341 R24 R26 C11 FR1 C12 FB R4OUT VCC VCS IC1 CPC GND R13 R15 D2,D4, D5,D6 R8C4 EM IS R12 R10 NTC AP3776 Typical Application of AP3776 with AP4341 (VOUT=5V/1A or 2A) C11 FR1 C12 L1 T1 FB R4OUT VCC VCS IC1 CPC GND R13 R15 C20 D2,D4, D5,D6 R8C4 EM IS C24 R23 R12 R10 CY1 GND VDETDRISR VCC AREF IC2 R20 C21 C23 NTC R21 R22 AP3776 APR343 C22 Typical Application of AP3776 with APR343 (VOUT=5V/2A or 2.4A)
Document number: DS36707 Rev. 4 - 2 3 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT Typical Applications Circuit (Cont.) C11 FR1 C12 L1 T1 FB R4OUT VCC VCS IC1 CPC GND R13 R15 D2,D4, D5,D6 R8C4 EM IS R12 R10 CY1 NTC AP3776 C21 C22 IC2 APR3415 R24 VCC AREF DRAIN DRAIN GND GND VDET DRISR R22 C23 R21 C24 C25 R23 Typical Application of AP3776 with APR3415 (VOUT=5V/2A or 2.4A) Pin Descriptions Pin Number Pin Name Function
1 IS Primary current sensing
2 EM Connected to the source of external power MOSFET
3 VCC Power supply
4 OUT Driving the gate of external power MOSFET
5 GND Ground
6 VCS Current sensing voltage
7 CPC Connecting a capacitor for output cable compensation
8 FB Voltage feedback
Document number: DS36707 Rev. 4 - 2 4 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT Functional Block Diagram Regulator Bias PFM TONS UVLO UVLO CV_ctrl PFM Driver R Q S R Q S CC_ctrl FB VCS CPC VCC OUT GND Cable Compensation Constant Voltage Control Constant Current Control Tonsec Detector 0.05V VFB PRO VREF1 COMP EA Peak Current Control & LEB TONS Dynamic Response Pro Dyn CC_ctrl Audio noise Suppression VREF2 Shutdown Pre_Shutdown Line Compensation EM2 IS1 Light Load Detection Tdelay Tdelay LL Hiccup Auto-restart OVP/OCKP/OTP/Rcs_ short_protection VREF3
Document number: DS36707 Rev. 4 - 2 5 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT Absolute Maximum Ratings (Note 4) Symbol Parameter Rating Unit VCC Voltage at VCC to GND -0.3 to 28 V – Voltage at OUT, EM to GND -0.3 to 23 V – Voltage at IS, VCS, CPC to GND -0.3 to 7 V – FB Input -40 to 10 V – Output Current at OUT Internally limited A TJ Operating Junction Temperature +150 ºC TSTG Storage Temperature -65 to +150 ºC TLEAD Lead Temperature (Soldering, 10 Sec) +300 ºC JA Thermal Resistance Junction-to-Ambient +190 º C/W ESD Electrostatic Discharge Capability Human Body Model 6000 V Charged Device Model 2500 V Machine Model 200 V Note 4: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stres s ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended O perating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Electrical Characteristics (@TA=+25° C, VCC=15V, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit UVLO SECTION VTH(ST) Start-up Threshold – 11 13 14 V VOPR(Min) Minimal Operating Voltage After turning on 5.3 6.1 7.0 STANDBY CURRENT SECTION IST Start-up Current VCC=VTH(ST)-1V, Before turning on 0 0.2 0.6 A ICC(STB) Standby Mode Quiescent Current No load at OUT pin, Standby Mode 60 100 130 ICC(QST) Normal Mode Quiescent Current No load at OUT pin, Normal Mode 160 280 330 CURRENT SENSE SECTION VCS Current Sense Threshold (Note 5) – 425 450 465 mV tLEB Leading Edge Blanking (Note 6) – 300 500 700 ns FEEDBACK INPUT SECTION RFB Input Resistance of FB Pin VFB=4V 0.5 0.7 0.9 M VFB Feedback Threshold Voltage – 3.64 3.7 3.76 V LINE COMPENSATION SECTION gm Line Compensation Transconductance CABLE COMPENSATION SECTION VFB _CABLE/VFB % Cable Compensation Voltage – 6 7 8 %
Document number: DS36707 Rev. 4 - 2 6 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT Electrical Characteristics (Cont.) (@TA=+25° C, VCC=15V, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit DRIVE OUTPUT SECTION VGATE_CLAMP Gate Clamp Voltage VCC=20V, CL=1nF – 14 16 V ISOURCE Source Current – 55 67 80 mA ISINK Sink Current – 400 500 600 mA tOFF(MAX) Maximum Off Time – 15 19 30 ms DYNAMIC FUNCTION SECTION tD Delay Time for Dynamic Function – 100 140 220 s VTRIGGER Trigger Voltage for Dynamic Function – 60 100 120 mV PROTECTION SECTION tonp(MAX) Maximum On Time of Primary Side – 16 25 40 s VFB(OVP) Over Voltage Protection – 6.5 7.5 8.5 V VFB(SCP) Short Circuit Protection – 2.38 2.50 2.62 V – Over Temperature Protection (Note 8) Junction Temperature +110 +130 +150 ºC – Temperature Hysteresis (Note 8) – – +20 – ºC Notes: 5, VCS is an equivalent parameter tested in closed loop to ensure the precise constant current. 6. The minimum power switch turn on time. 7. Line compensation voltage on CS pin: 8. Guaranteed by design. 1716 PRI AUX DC_INCS RgRR R N
Document number: DS36707 Rev. 4 - 2 7 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT Performance Characteristics Start-up Threshold vs. Temperature Start-up Current vs. Temperature Minimum Operating Voltage vs. Temperature Standby Mode Quiescent Current vs. Temperature Normal Mode Quiescent Current vs. Temperature -40 -20 0 20 40 60 80 100 120 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 Start-up Threshold (V) Temperature ( o -40 -20 0 20 40 60 80 100 120 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 Start-up Current (A) Temperature ( o -40 -20 0 20 40 60 80 100 120 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 Minimal Operating Voltage (V) Temperature ( o -40 -20 0 20 40 60 80 100 120 100 110 120 Standby Mode Quiescent Current (A) Temperature ( o -40 -20 0 20 40 60 80 100 120 240 250 260 270 280 290 300 310 320 Normal Mode Quiescent Current (A) Temperature ( o
Figure 2. The Operation Waveform of Flyback PSR System Where, the fSW is the switching frequency. When the peak current IPK is constant, the output power depends on the switching frequency fSW. The maximum frequency for AP3776 system is about 84kHz. Where the Vd is the diode forward voltage drop.
Figure 3. Auxiliary Voltage Waveform loop control function of AP3776 then generates a D1 off-time to regulate the output voltage. The AP3776 can work in constant-current (CC) mode. Figure 2 shows the secondary current waveforms. Therefore, AP3776 can realize CC mode operation by constant primary peak current and fixed diode conduction duty cycle. since switching frequency decrease to audio frequency range, about less than 20kHz. mode), the current reference is also VCS_L. But the LL mode operating is different, which will be described in next section. above 24kHz from light load to heavy load and guarantee the audible noise free performance.
Figure 4. Multiple Segment Peak Current at CV Mode
- The LL Mode Operating (Typical Application with APR343)
ultra low standby power in LL mode, the static current (ICC_NL) of the AP3776 is reduced from 280μA to 100μA.
- The conditions of exiting LL mode---VCPC>65mV or tOFF<tDELAY+30μs
- The conditions of entering LL mode---VCPC<33mV and tOFF≥tDELAY+30μs In LL mode, when the APR343 detects the output voltage is lower than its trigger voltage, the APR343 VDET pin emits a periodical pulse current. This pulse current will generate a pulse voltage on feedback winding thro ugh the transformer coupling. When the AP3776 detects this VPULSE (>100mV is valid), primary switch immediately turns on to provide one energy pulse to supply output terminal and primary V CC. To achieve low standby power, the lower switching frequency is necessary. But if the off time is too long, the VCC voltage will reduce to very low level. To avoid V CC being lower than VOPR(Min), a minimum switching frequency is specified by the APR343 (tDIS). If VOUT does not fall below trigger voltage during tDIS, APR343 VDET pin will emit the periodical pulse current and let the primary switch turn on. 4. Leading Edge Blanking When the power switch is turned on, a turn -on spike will occur on the sense-resistor. To avoid false-termination of the switching pulse, a 500ns leading-edge blanking (from power MOSFET on) is built in. During this blanking period, the current sense comparator is disabled and the gate driver can’t be switched off. 5. Adjustable Line Compensation Since there is a constant delay time from the CS pin voltage reaching the given VCS reference to the power MOSFET turning off, the real primary peak current value always has a gap with the ideal value. The gap value changes with different input line voltage, which is caused by different current rising slope, results in different system constant current value. In order to eliminate the constant current deviation due to line voltage, the adjustable line comp ensation is introduced to AP3776 design. By sensing the negative voltage of FB pin which is linear to the line voltage, a current (ILINE) proportional to line voltage flows out from the CS pin to the resistor RLINE, and create an adjustable compensation voltage to clear up the primary current gap, so that the excellent line regulation of output current will be achieved. indc p aux FBFB FB LINELINECS VN N RR R 700 14.0
Document number: DS36707 Rev. 4 - 2 14 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT
Ordering Information
TR : Tape & ReelM : SO-8 G1 : Green Product Name RoHS/Green Package Temperature Range Part Number Marking ID Packing SO-8 -40 to +85° C AP3776MTR-G1 3776M-G1 4000/Tape & Reel Marking Information (Top View) 3776M-G1: Logo and Marking ID Third Line: Date Code Y: Year WW: Work Week of Molding A: Assembly House Code XX: 7th and 8th Digits of Batch No. 3776M -G1 YWWAXX
Document number: DS36707 Rev. 4 - 2 15 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: SO-8 0 ° 8 ° 1 ° 7 ° R0.150(0.006) R0.150(0.006) 1.000(0.039) 0.300(0.012) 0.510(0.020) 1.350(0.053) 1.750(0.069) 0.100(0.004) 0.300(0.012) 3.800(0.150) 4.000(0.157) 7 ° 20:1 D 1.270(0.050) TYP 0.150(0.006) 0.250(0.010) 8 ° D 5.800(0.228) 6.200(0.244) 0.600(0.024) 0.725(0.029) 0.320(0.013) 8 ° 0.450(0.017) 0.820(0.032) 4.700(0.185) 5.100(0.201) Note: Eject hole, oriented hole and mold mark is optional. Option 1 Option 1 Option 2 0.350(0.014) TYP TYP TYP 9°~ 9°~
Document number: DS36707 Rev. 4 - 2 16 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT Suggested Pad Layout (1) Package Type: SO-8 Grid placement courtyard ZG Y E X Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) E (mm)/(inch)
Document number: DS36707 Rev. 4 - 2 17 of 17 www.diodes.com February 2015 © Diodes Incorporated AP3776 A Product Line of Diodes Incorporated NEW PRODUCT IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any lia bility arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license unde r its patent or trademark rights, nor the rights of others. Any Customer or user of this document or pro ducts described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diod es Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product nam es and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into multiple languages for reference. Only the English version of t his document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety -critical, life support devices or systems, notwithstanding any devices - or systems -related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2015, Diodes Incorporated www.diodes.com